Algebraic codebook system and method

Abstract

Code-excited linear prediction speech encoders/decoders with excitation including an algebraic codebook contribution encoded with a single sign bit for each track of pulses by inferring pulse amplitude signs from the pulse position code ordering within a codeword.

1. A method of algebraic codebook vector encoding, comprising:
 (a) finding a pivot pulse position in a track of positions of a algebraic codebook vector, said track having three or more pulses which may have coincident positions; and  
 (b) ordering pulse position codes for pulse positions in said track with respect to a pulse position code for said pivot pulse position to encode pulse amplitude signs of pulses associated with said pulse positions.  
 
   
   
     2. The method of  claim 1 , wherein:
 (a) the number of unit amplitude pulses in said track equals three, wherein when two or three pulses have the same position, their amplitudes add.